Different actuators have been developed for active noise cancellation. Forvolumetric applications, a loudspeaker is usually used. When the noise isinduced by engines it may be more efficient to work on the noise sourceitself, the engine vibration. In this case it is important to have anactuator that can counteract the vibration, not the sound field. In theresearch project AVIIS (Active Vibration Isolation In Ships), such anactuator has been developed. The actuator is an electrodynamic, inertialmass type shaker, designed and tuned for this project. The boat used inthese experiments is a Storebro Royal Cruiser 33, powered by two Volvo PentaTAMD engines. Prior research, \cite{thomas1} shows that the maintransmission paths for the vibrations from the engine and the propeller tothe hull, are through these four mounting points. Once the hull is excited,a lot of sound and annoying noise is produced in the cabin. The main idea isto isolate these vibrations from the hull by adding a combined active andpassive engine mount that will control the vibrations by minimizing thesound field in the cabin using microphones as error sensors.